WO2000026514A1 - Exhaust gas cooler - Google Patents

Exhaust gas cooler Download PDF

Info

Publication number
WO2000026514A1
WO2000026514A1 PCT/GB1999/003581 GB9903581W WO0026514A1 WO 2000026514 A1 WO2000026514 A1 WO 2000026514A1 GB 9903581 W GB9903581 W GB 9903581W WO 0026514 A1 WO0026514 A1 WO 0026514A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust gas
gas cooler
coolant
tube
cooler according
Prior art date
Application number
PCT/GB1999/003581
Other languages
French (fr)
Inventor
George Atkinson
Original Assignee
Serck Heat Transfer Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Serck Heat Transfer Limited filed Critical Serck Heat Transfer Limited
Priority to EP99954096A priority Critical patent/EP1127215A1/en
Priority to JP2000579873A priority patent/JP2002529636A/en
Priority to AU10540/00A priority patent/AU1054000A/en
Publication of WO2000026514A1 publication Critical patent/WO2000026514A1/en
Priority to US09/846,030 priority patent/US6811756B2/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/163—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with conduit assemblies having a particular shape, e.g. square or annular; with assemblies of conduits having different geometrical features; with multiple groups of conduits connected in series or parallel and arranged inside common casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • F01N3/043—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids without contact between liquid and exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • This invention relates to an exhaust gas cooler for reducing the temperature of exhaust gases from internal combustion engines.
  • the invention relates to an exhaust gas cooler in which a coolant is passed around passages through which the exhaust gas travels.
  • Figs, la to lc show a known exhaust gas cooler.
  • This prior art cooler comprises a circular tube 1 which has tapered ends 2 which serve as entry 3 and exit 4 orifices for exhaust gases.
  • the orifices are provided with flange plates 10 for connection to exhaust pipes.
  • the ends of the tube are sealed by circular tube plates 5 which define a coolant chamber inside the tube.
  • Each tube plate 5 has a number of circular holes 6 arranged through it.
  • the holes 6 in each tube plate 5 are connected by a number of small diameter tubes 7 which are sealed at one end to the first tube plate and at the other end to the second tube plate. Exhaust gases flow into the entry orifice 3, along the inside of the small diameter tubes 7 and out of the exit orifice 4.
  • the exterior of the tube is provided with entry and exit nozzles 8, 9 which communicate with the coolant chamber for the supply of coolant liquid.
  • a bracket 11 is fixed to the tube for mounting the exhaust gas cooler.
  • an exhaust gas cooler comprising: an external tube having first and second end walls within said tube, said external tube and end walls defining a coolant chamber between said end walls and first and second exhaust gas chambers outside said first and second end walls respectively, coolant inlet and outlet means communicating with said coolant chamber, a plurality of internal tubes extending from said first end wall to said second end wall and arranged such that the interior of each internal tube communicates with said first and second exhaust gas chambers , and exhaust gas inlet and outlet means communicating with said first and second exhaust gas chambers respectively, wherein the external tube has a cross-sectional shape which has a height in the major axis which is greater than its width in the minor axis perpendicular to the major axis.
  • the cross-sectional shape of the external tube is substantially oval, most preferably it comprises two semi-circles connected by common straight line tangents parallel to the major axis.
  • Such a cross-sectional shape means that the exterior tube has a planar face which simplifies the fitting of mounting brackets and placement within an engine compartment.
  • An oval shape offers advantages over rectangular cross- sectional shapes, since the tube is less prone to cracking, and sharp re-entrant angles in the tube are avoided, reducing stress concentration.
  • the internal tubes are circular in cross- section. It has been found that circular tubes are less prone to clogging with particles carried by the exhaust gases than rectangular tubes, because they do not present internal corners in which particulate matter can collect.
  • the internal tubes are arranged in a hexagonal close packed arrangement, such that each internal tube is spaced by the same spacing from its closest neighbouring internal tubes.
  • the spacing is less than 2 mm, most preferably less than 1 mm.
  • the spacing is between 10% and 20% of the diameter of the tubes.
  • the exhaust gas cooler is made from stainless steel.
  • each of the exhaust gas inlet and outlet means comprises a flange plate adapted to connect to a corresponding flange plate on a connecting exhaust pipe and having an aperture therein to permit the through flow of exhaust gases .
  • each of said first and second exhaust gas chambers is further defined by a tapering cylindrical member extending from said aperture to said external tube .
  • the coolant inlet and outlet means comprise tubular pipes adapted to be connected to a coolant hose, most preferably extending substantially in the plane containing the longitudinal axis of the external tube and the major axis of the cross-section of the external tube.
  • the coolant inlet means is located adjacent to one of the first and second end walls and the coolant outlet means is located adjacent to the other of the first and second end walls.
  • the coolant inlet and outlet means extend from opposite sides of the external tube.
  • a longitudinally extending portion of the coolant chamber adjacent to each of the coolant inlet and outlet means has no internal tubes extending therethrough, such that it forms a coolant passage having an unobstructed area.
  • This may be achieved by omitting a row of internal tubes from the close-packed arrangement at the top and bottom of the external tube.
  • the unobstructed area has a minimum transverse dimension greater than the diameter of an internal tube.
  • the unobstructed area of each passage extends over at least 10% of the internal height of the external tube, most preferably at least 15%.
  • Figs, la, lb, and lc are a side elevation, a partial sectional view on line A-A, and an end elevation of a prior art exhaust gas cooler;
  • Fig. 2 is a side elevation of an exhaust gas cooler according to a first aspect of the invention
  • Fig. 3 is an end elevation of the device of Fig. 2;
  • Fig. 4 is a sectional view on line B-B of the device of Fig. 2.
  • the cooler comprises an external cylindrical tube 20 whose cross- section comprises two semi-circular portions 21, 22 connected by two tangential portions 23, 24.
  • the tube At each end of the tube are fixed tapered cap portions 25a, 25b which are adapted to fit over the end of the tube and be fastened by suitable means such as welding.
  • a flange plate 26 At the narrow end of the tapered cap portion 25a, 25b is a flange plate 26 provided with two holes 27 for attachment to a corresponding flange plate (not shown) in order to secure the cooler to an exhaust pipe or line (not shown) .
  • the flange plates 26 also each contain a larger hole which serves as entry 28 or exit 29 orifices for exhaust gases.
  • the ends of the tube 20 are sealed internally by two oval tube plates 30a, 30b, whose shape corresponds to the internal profile of the tube 20.
  • the volume bounded by the tube 20 and plates 30a, 30b forms a coolant chamber 31 inside the tube.
  • Each volume bounded by the tube cap 25a, 25b and the respective plate 30a, 30b forms an exhaust gas chamber 39a, 39b outside the coolant chamber 31 inside the tube.
  • Each tube plate 30a, 30b has 37 circular holes 32 arranged through it.
  • the holes 32 are arranged in a close hexagonal packing (CHP) pattern as shown in Fig. 4 in 9 rows of 3 , 4 or 5 holes.
  • the holes 32 in each tube plate 30a, 30b are connected by 37 small diameter tubes 38 which are sealed at one end to the first tube plate 30a and at the other end to the second tube plate 30b.
  • CHP close hexagonal packing
  • the tubes 38 have a diameter of between 5 and 8 mm, usually about 6.5 mm.
  • the spacing between the tubes is about 1 mm or less, so the tube plate 30a does not present a significant obstruction to flow of the exhaust gases.
  • a cooling water inlet pipe 33 Arranged at a first end of the exterior tube is a cooling water inlet pipe 33 whose longitudinal axis is in the same plane as the longitudinal axis 50 and the major axis 40 of the exterior cylinder 20. In this way the hose connections (not shown) will not extend outside the envelope defined by the width of the exterior tube 20.
  • a cooling water outlet pipe 34 whose axis is in the same plane as that of the inlet pipe 33.
  • the inlet and outlet pipes 33, 34 each communicate with the coolant chamber 31 for the supply of coolant liquid. As coolant passes from the inlet 33 to the outlet 34 and exhaust gases pass along the small diameter tubes 38, heat transfer takes place from the exhaust gas via the surfaces of the small diameter tubes 38 to the cooling water.
  • both the inlet and outlet pipes 33, 34 join the exterior tube at opposite ends of the tube.
  • both the inlet and outlet pipes 33, 34 incorporate a 90° bend, so that the hose connections to the ends 35 of the pipes 33, 34 may be made parallel to the longitudinal axis 50 of the tube.
  • either of the inlet or outlet pipes 33, 34 may be straight so that the hose connections to the ends 35 may be made perpendicular to the longitudinal axis 50 of the tube, or that either of the inlet or outlet pipes 33, 34 may incorporate a bend of an intermediate angle less than 90°.
  • Either of the inlet or outlet pipes 33, 34 may be reversed so that the open end 35 faces towards the centre of the exhaust gas cooler, instead of facing away from the centre of the exhaust gas cooler as shown in Fig. 2.
  • a mounting plate 45 is provided on one side of the exhaust gas cooler, to enable the cooler to be secured within an engine compartment.
  • the mounting plate has three leg portions 46 formed by double bending of the plate. These serve to space the exhaust gas cooler from the surface to which it is mounted.
  • Each leg portion 46 has a mounting hole 47 for a bolt or similar fastener.
  • the oval shape of the apparatus enables the exhaust gas cooler of the invention to fit into much tighter spaces in the engine compartment than prior art coolers, while maintaining the benefits of closely packed tubes forming the cooling core.
  • the layout of the tubes in the cooler according to the invention is novel while still maximising the efficiency of the gas and coolant flow.
  • the cooler is highly resistant to corrosion due to its stainless steel construction, and very robust due to the absence of sharp corners on the exterior tube. The flow patterns achieved in testing have shown that the arrangement provides a high resistance to clogging from soot particles.
  • the invention shows a close packing arrangement with 37 tubes, giving the same flow area as prior art tubes, it is to be understood that other arrangements are possible.
  • additional rows of tubes can be added, increasing the height H, without increasing the width W of the exterior tube 20.
  • the top and bottom rows 60, 61 of tubes may be omitted, which in effect provides enlarged passages 62, 63 for coolant water at the top and bottom of the coolant chamber. This arrangement has been found to provide particularly advantageous flow characteristics and exhaust gas cooler performance.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Chimneys And Flues (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)
  • Exhaust Silencers (AREA)

Abstract

An exhaust gas cooler for reducing the temperature of exhaust gases from internal combustion engines, comprising an external tube (20) extending between two tube plates (30a, 30b) or end walls and defining a coolant chamber (31), coolant inlet and outlet means (33, 34) communicating with the coolant chamber, and a plurality of internal tubes (38) extending between the end walls and arranged to carry the exhaust gas through the coolant chamber. The external tube (20) has a cross-sectional shape which has a height (H) in the major axis which is greater than its width (W) in the minor axis perpendicular to the major axis, preferably oval, or comprising two semi-circles (21, 22) connected by common straight line tangents (23, 24) parallel to the major axis. Such a cross-sectional shape means that the exterior tube (20) has a planar face (23, 24) which simplifies the fitting of mounting brackets and placement within an engine compartment.

Description

Exhaust Gas Cooler
This invention relates to an exhaust gas cooler for reducing the temperature of exhaust gases from internal combustion engines. In particular the invention relates to an exhaust gas cooler in which a coolant is passed around passages through which the exhaust gas travels.
Figs, la to lc show a known exhaust gas cooler. This prior art cooler comprises a circular tube 1 which has tapered ends 2 which serve as entry 3 and exit 4 orifices for exhaust gases. The orifices are provided with flange plates 10 for connection to exhaust pipes. The ends of the tube are sealed by circular tube plates 5 which define a coolant chamber inside the tube. Each tube plate 5 has a number of circular holes 6 arranged through it. The holes 6 in each tube plate 5 are connected by a number of small diameter tubes 7 which are sealed at one end to the first tube plate and at the other end to the second tube plate. Exhaust gases flow into the entry orifice 3, along the inside of the small diameter tubes 7 and out of the exit orifice 4. The exterior of the tube is provided with entry and exit nozzles 8, 9 which communicate with the coolant chamber for the supply of coolant liquid. A bracket 11 is fixed to the tube for mounting the exhaust gas cooler.
Similar prior art exhaust gas coolers are known for example from US Patent No 4,685,292. In all the prior art coolers the tubes which carry the exhaust gases are arranged within a cooling chamber of circular cross- section. This results in exhaust gas coolers which are bulky and inefficient in their use of space and do not fit easily within the frequently cramped engine layout. It is an object of the present invention to provide an exhaust gas cooler which is more compact in shape and yet provides flow characteristics comparable or superior to prior art gas coolers.
According to a first aspect of the present invention there is provided an exhaust gas cooler comprising: an external tube having first and second end walls within said tube, said external tube and end walls defining a coolant chamber between said end walls and first and second exhaust gas chambers outside said first and second end walls respectively, coolant inlet and outlet means communicating with said coolant chamber, a plurality of internal tubes extending from said first end wall to said second end wall and arranged such that the interior of each internal tube communicates with said first and second exhaust gas chambers , and exhaust gas inlet and outlet means communicating with said first and second exhaust gas chambers respectively, wherein the external tube has a cross-sectional shape which has a height in the major axis which is greater than its width in the minor axis perpendicular to the major axis.
Preferably the cross-sectional shape of the external tube is substantially oval, most preferably it comprises two semi-circles connected by common straight line tangents parallel to the major axis. Such a cross-sectional shape means that the exterior tube has a planar face which simplifies the fitting of mounting brackets and placement within an engine compartment. An oval shape offers advantages over rectangular cross- sectional shapes, since the tube is less prone to cracking, and sharp re-entrant angles in the tube are avoided, reducing stress concentration.
Preferably the internal tubes are circular in cross- section. It has been found that circular tubes are less prone to clogging with particles carried by the exhaust gases than rectangular tubes, because they do not present internal corners in which particulate matter can collect.
Preferably the internal tubes are arranged in a hexagonal close packed arrangement, such that each internal tube is spaced by the same spacing from its closest neighbouring internal tubes. Preferably the spacing is less than 2 mm, most preferably less than 1 mm. Preferably the spacing is between 10% and 20% of the diameter of the tubes.
Preferably the exhaust gas cooler is made from stainless steel.
Preferably each of the exhaust gas inlet and outlet means comprises a flange plate adapted to connect to a corresponding flange plate on a connecting exhaust pipe and having an aperture therein to permit the through flow of exhaust gases . Preferably each of said first and second exhaust gas chambers is further defined by a tapering cylindrical member extending from said aperture to said external tube .
Preferably the coolant inlet and outlet means comprise tubular pipes adapted to be connected to a coolant hose, most preferably extending substantially in the plane containing the longitudinal axis of the external tube and the major axis of the cross-section of the external tube. Preferably the coolant inlet means is located adjacent to one of the first and second end walls and the coolant outlet means is located adjacent to the other of the first and second end walls. Preferably the coolant inlet and outlet means extend from opposite sides of the external tube.
Preferably a longitudinally extending portion of the coolant chamber adjacent to each of the coolant inlet and outlet means has no internal tubes extending therethrough, such that it forms a coolant passage having an unobstructed area. This may be achieved by omitting a row of internal tubes from the close-packed arrangement at the top and bottom of the external tube. Preferably the unobstructed area has a minimum transverse dimension greater than the diameter of an internal tube. Preferably the unobstructed area of each passage extends over at least 10% of the internal height of the external tube, most preferably at least 15%.
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying figures, where:
Figs, la, lb, and lc are a side elevation, a partial sectional view on line A-A, and an end elevation of a prior art exhaust gas cooler;
Fig. 2 is a side elevation of an exhaust gas cooler according to a first aspect of the invention;
Fig. 3 is an end elevation of the device of Fig. 2; and
Fig. 4 is a sectional view on line B-B of the device of Fig. 2.
Referring to Figs . 2 to 4 there is shown an exhaust gas cooler according to the invention. The cooler comprises an external cylindrical tube 20 whose cross- section comprises two semi-circular portions 21, 22 connected by two tangential portions 23, 24. At each end of the tube are fixed tapered cap portions 25a, 25b which are adapted to fit over the end of the tube and be fastened by suitable means such as welding. At the narrow end of the tapered cap portion 25a, 25b is a flange plate 26 provided with two holes 27 for attachment to a corresponding flange plate (not shown) in order to secure the cooler to an exhaust pipe or line (not shown) . The flange plates 26 also each contain a larger hole which serves as entry 28 or exit 29 orifices for exhaust gases.
The ends of the tube 20 are sealed internally by two oval tube plates 30a, 30b, whose shape corresponds to the internal profile of the tube 20. The volume bounded by the tube 20 and plates 30a, 30b forms a coolant chamber 31 inside the tube. Each volume bounded by the tube cap 25a, 25b and the respective plate 30a, 30b forms an exhaust gas chamber 39a, 39b outside the coolant chamber 31 inside the tube. Each tube plate 30a, 30b has 37 circular holes 32 arranged through it. The holes 32 are arranged in a close hexagonal packing (CHP) pattern as shown in Fig. 4 in 9 rows of 3 , 4 or 5 holes. The holes 32 in each tube plate 30a, 30b are connected by 37 small diameter tubes 38 which are sealed at one end to the first tube plate 30a and at the other end to the second tube plate 30b.
It has been found that a CHP pattern maximises the flow efficiency, while the particular arrangement of Fig. 4, in which the three principal axes are arranged perpendicular to and at 30° to the major axis 40 of the tube 20 provides an optimum means of packing the interior tubes within the exterior tube.
Exhaust gases flow into the entry orifice 28, along the inside of the small diameter tubes 38 and out of the exit orifice 29. The tubes 38 have a diameter of between 5 and 8 mm, usually about 6.5 mm. The spacing between the tubes is about 1 mm or less, so the tube plate 30a does not present a significant obstruction to flow of the exhaust gases.
Arranged at a first end of the exterior tube is a cooling water inlet pipe 33 whose longitudinal axis is in the same plane as the longitudinal axis 50 and the major axis 40 of the exterior cylinder 20. In this way the hose connections (not shown) will not extend outside the envelope defined by the width of the exterior tube 20. Similarly at the second end of the exterior tube 20 is a cooling water outlet pipe 34 whose axis is in the same plane as that of the inlet pipe 33. The inlet and outlet pipes 33, 34 each communicate with the coolant chamber 31 for the supply of coolant liquid. As coolant passes from the inlet 33 to the outlet 34 and exhaust gases pass along the small diameter tubes 38, heat transfer takes place from the exhaust gas via the surfaces of the small diameter tubes 38 to the cooling water.
The inlet 33 and outlet 34 join the exterior tube at opposite ends of the tube. In the embodiment illustrated both the inlet and outlet pipes 33, 34 incorporate a 90° bend, so that the hose connections to the ends 35 of the pipes 33, 34 may be made parallel to the longitudinal axis 50 of the tube. It is to be understood that either of the inlet or outlet pipes 33, 34 may be straight so that the hose connections to the ends 35 may be made perpendicular to the longitudinal axis 50 of the tube, or that either of the inlet or outlet pipes 33, 34 may incorporate a bend of an intermediate angle less than 90°. Either of the inlet or outlet pipes 33, 34 may be reversed so that the open end 35 faces towards the centre of the exhaust gas cooler, instead of facing away from the centre of the exhaust gas cooler as shown in Fig. 2.
A mounting plate 45 is provided on one side of the exhaust gas cooler, to enable the cooler to be secured within an engine compartment. In the embodiment shown the mounting plate has three leg portions 46 formed by double bending of the plate. These serve to space the exhaust gas cooler from the surface to which it is mounted. Each leg portion 46 has a mounting hole 47 for a bolt or similar fastener.
The oval shape of the apparatus enables the exhaust gas cooler of the invention to fit into much tighter spaces in the engine compartment than prior art coolers, while maintaining the benefits of closely packed tubes forming the cooling core. The layout of the tubes in the cooler according to the invention is novel while still maximising the efficiency of the gas and coolant flow. The cooler is highly resistant to corrosion due to its stainless steel construction, and very robust due to the absence of sharp corners on the exterior tube. The flow patterns achieved in testing have shown that the arrangement provides a high resistance to clogging from soot particles.
Although the invention shows a close packing arrangement with 37 tubes, giving the same flow area as prior art tubes, it is to be understood that other arrangements are possible. For example additional rows of tubes can be added, increasing the height H, without increasing the width W of the exterior tube 20. In a particular embodiment the top and bottom rows 60, 61 of tubes may be omitted, which in effect provides enlarged passages 62, 63 for coolant water at the top and bottom of the coolant chamber. This arrangement has been found to provide particularly advantageous flow characteristics and exhaust gas cooler performance.
These and other modifications and improvements can be incorporated without departing from the scope of the invention.

Claims

1. An exhaust gas cooler comprising: an external tube (20) having first and second end walls (30a, 30b) within said tube, said external tube and end walls defining a coolant chamber (31) between said end walls and first and second exhaust gas chambers (39a, 39b) outside said first and second end walls (30a, 30b) respectively, coolant inlet (33) and outlet (34) means communicating with said coolant chamber (31) , a plurality of internal tubes (38) extending from said first end wall (30) to said second end wall (30) and arranged such that the interior of each internal tube (38) communicates with said first and second exhaust gas chambers (39a, 39b) , and exhaust gas inlet and outlet means (28, 29) communicating with said first and second exhaust gas chambers (39a, 39b) respectively, wherein the external tube (20) has a cross-sectional shape which has a height (H) in the major axis (40) which is greater than its width ( ) in the minor axis (41) perpendicular to the major axis.
2. An exhaust gas cooler according to Claim 1, wherein the cross-sectional shape of the external tube (20) is substantially oval.
3. An exhaust gas cooler according to Claim 1, wherein the cross-sectional shape of the external tube (20) comprises two semi-circles (21, 22) connected by common straight line tangents (23, 24) parallel to the major axis (40) .
4. An exhaust gas cooler according to any preceding claim, wherein the internal tubes (38) are circular in cross-section.
5. An exhaust gas cooler according to any preceding claim, wherein the internal tubes (38) are arranged in a hexagonal close packed arrangement, such that each internal tube (38) is spaced by the same spacing from its closest neighbouring internal tubes.
6. An exhaust gas cooler according to claim 5, wherein the spacing between adjacent internal tubes (38) is less than 2 mm.
7. An exhaust gas cooler according to claim 5 or 6 , wherein the spacing between adjacent internal tubes (38) is between 10% and 20% of the diameter of the tubes.
8. An exhaust gas cooler according to any preceding claim, wherein the exhaust gas cooler is made from stainless steel.
9. An exhaust gas cooler according to any preceding claim, wherein each of the exhaust gas inlet (28) and outlet (29) means comprises a flange plate (26) adapted to connect to a corresponding flange plate on a connecting exhaust pipe and having an aperture therein to permit the through flow of exhaust gases.
10. An exhaust gas cooler according to any preceding claim, wherein the coolant inlet (33) and outlet (34) means comprise tubular pipes adapted to be connected to a coolant hose and extending substantially in the plane containing the longitudinal axis (50) of the external tube and the major axis (40) of the cross-section of the external tube.
11. An exhaust gas cooler according to Claim 10, wherein the coolant inlet means (33) is located adjacent to one of the first and second end walls (30a, 30b) and the coolant outlet means (34) is located adjacent to the other of the first and second end walls (30a, 30b) .
12. An exhaust gas cooler according to Claim 10 or 11, wherein the coolant inlet means (33) is located at one side of the external tube (2) on the major axis (40) and the coolant outlet means (33) is located on the diametrically opposite side of the external tube (2) on the major axis (40) .
13. An exhaust gas cooler according to any preceding claim, wherein each of said first and second exhaust gas chambers (39a, 39b) is further defined by a tapering cylindrical member (25) extending from said aperture to said external tube .
14. An exhaust gas cooler according to any preceding claim, wherein a longitudinally extending portion of the coolant chamber (31) adjacent to the coolant inlet means (33) has no internal tubes (38) extending therethrough, such that it forms a coolant passage (63) having an unobstructed area.
15. An exhaust gas cooler according to any preceding claim, wherein a longitudinally extending portion of the coolant chamber (31) adjacent to the coolant outlet means (34) has no internal tubes (38) extending therethrough, such that it forms a coolant passage (62) having an unobstructed area.
16. An exhaust gas cooler according to claim 14 or 15, wherein the unobstructed area has a minimum transverse dimension greater than the diameter of an internal tube (38) .
PCT/GB1999/003581 1998-10-30 1999-10-29 Exhaust gas cooler WO2000026514A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP99954096A EP1127215A1 (en) 1998-10-30 1999-10-29 Exhaust gas cooler
JP2000579873A JP2002529636A (en) 1998-10-30 1999-10-29 Exhaust gas cooler
AU10540/00A AU1054000A (en) 1998-10-30 1999-10-29 Exhaust gas cooler
US09/846,030 US6811756B2 (en) 1998-10-30 2001-04-30 Exhaust gas cooler

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9823669.8 1998-10-30
GBGB9823669.8A GB9823669D0 (en) 1998-10-30 1998-10-30 Exhaust gas cooler

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/846,030 Continuation US6811756B2 (en) 1998-10-30 2001-04-30 Exhaust gas cooler

Publications (1)

Publication Number Publication Date
WO2000026514A1 true WO2000026514A1 (en) 2000-05-11

Family

ID=10841489

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/003581 WO2000026514A1 (en) 1998-10-30 1999-10-29 Exhaust gas cooler

Country Status (6)

Country Link
US (1) US6811756B2 (en)
EP (1) EP1127215A1 (en)
JP (1) JP2002529636A (en)
AU (1) AU1054000A (en)
GB (1) GB9823669D0 (en)
WO (1) WO2000026514A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004065876A1 (en) 2003-01-24 2004-08-05 Behr Gmbh & Co. Kg Heat exchanger, particularly exhaust gas cooler for motor vehicles
US6811756B2 (en) 1998-10-30 2004-11-02 Honeywell International Inc Exhaust gas cooler
EP1298403A3 (en) * 2001-09-26 2006-05-10 Behr GmbH & Co. KG Device for fastening an exhaust gas heat exchanger
WO2007073453A2 (en) * 2005-11-15 2007-06-28 Honeywell International Inc. Heat exchanger with integral shell and tube plates
WO2007105815A1 (en) * 2006-03-16 2007-09-20 Toyota Jidosha Kabushiki Kaisha Exhaust gas heat recovery device
EP1884634A2 (en) 2006-08-04 2008-02-06 Toyota Jidosha Kabushiki Kaisha Support structure of exhaust system heat exchanger
CN101405484B (en) * 2006-03-16 2010-12-15 丰田自动车株式会社 Exhaust gas heat recovery device
WO2015058946A1 (en) * 2013-10-23 2015-04-30 Güntner Gmbh & Co. Kg Housing device for a heat exchanger

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007010134A1 (en) 2007-02-28 2008-09-04 Behr Gmbh & Co. Kg Heat exchanger e.g. radiator, for e.g. exhaust gas recycling system of diesel engine, has block closure element for fluid-sealed separation of chamber and fluid contact, and housing provided for connecting block at contact
US7971432B2 (en) * 2007-07-13 2011-07-05 Paccar Inc Flow diffuser for exhaust pipe
US20090014235A1 (en) * 2007-07-13 2009-01-15 Paccar Inc Flow diffuser for exhaust pipe
US8046989B2 (en) * 2007-11-14 2011-11-01 Paccar Inc Cooling device for high temperature exhaust
SE532900C2 (en) * 2008-03-31 2010-05-04 Titanx Engine Cooling Holding Heat exchanger including end plate.
FR2943384B1 (en) * 2009-03-23 2011-03-04 Renault Sas EXHAUST CIRCUIT FOR MOTOR VEHICLE
WO2013184135A1 (en) * 2012-06-08 2013-12-12 International Engine Intellectual Property Company, Llc Egr cooler header casting

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748830A (en) * 1972-05-19 1973-07-31 Ross S Method and apparatus for purifying combustion gases
JPS59109776A (en) * 1982-12-14 1984-06-25 Sasakura Eng Co Ltd Multiple heat exchanger
US4685292A (en) * 1985-09-09 1987-08-11 Zwick Energy Research Organization, Inc. Exhaust cooling system for internal combustion engine
DE19907163A1 (en) * 1998-04-24 1999-10-28 Behr Gmbh & Co Exhaust gas heat exchanger

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949548A (en) * 1974-06-13 1976-04-13 Lockwood Jr Hanford N Gas turbine regeneration system
US4267812A (en) * 1979-10-09 1981-05-19 Ford Motor Company Engine EGR cooler
CA2116745C (en) * 1993-03-03 2007-05-15 Shuichi Nagato Pressurized internal circulating fluidized-bed boiler
US5732688A (en) * 1996-12-11 1998-03-31 Cummins Engine Company, Inc. System for controlling recirculated exhaust gas temperature in an internal combustion engine
US6079395A (en) * 1998-09-30 2000-06-27 Caterpillar Inc. Exhaust gas recirculation system
GB9823669D0 (en) 1998-10-30 1998-12-23 Serck Heat Transfer Limited Exhaust gas cooler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748830A (en) * 1972-05-19 1973-07-31 Ross S Method and apparatus for purifying combustion gases
JPS59109776A (en) * 1982-12-14 1984-06-25 Sasakura Eng Co Ltd Multiple heat exchanger
US4685292A (en) * 1985-09-09 1987-08-11 Zwick Energy Research Organization, Inc. Exhaust cooling system for internal combustion engine
DE19907163A1 (en) * 1998-04-24 1999-10-28 Behr Gmbh & Co Exhaust gas heat exchanger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 227 (M - 332) 18 October 1984 (1984-10-18) *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6811756B2 (en) 1998-10-30 2004-11-02 Honeywell International Inc Exhaust gas cooler
EP1298403A3 (en) * 2001-09-26 2006-05-10 Behr GmbH & Co. KG Device for fastening an exhaust gas heat exchanger
WO2004065876A1 (en) 2003-01-24 2004-08-05 Behr Gmbh & Co. Kg Heat exchanger, particularly exhaust gas cooler for motor vehicles
WO2007073453A2 (en) * 2005-11-15 2007-06-28 Honeywell International Inc. Heat exchanger with integral shell and tube plates
WO2007073453A3 (en) * 2005-11-15 2007-09-20 Honeywell Int Inc Heat exchanger with integral shell and tube plates
WO2007105815A1 (en) * 2006-03-16 2007-09-20 Toyota Jidosha Kabushiki Kaisha Exhaust gas heat recovery device
CN101405484B (en) * 2006-03-16 2010-12-15 丰田自动车株式会社 Exhaust gas heat recovery device
US8297049B2 (en) 2006-03-16 2012-10-30 Toyota Jidosha Kabushiki Kaisha Exhaust gas heat recovery device
EP1884634A2 (en) 2006-08-04 2008-02-06 Toyota Jidosha Kabushiki Kaisha Support structure of exhaust system heat exchanger
EP1884634A3 (en) * 2006-08-04 2008-12-31 Toyota Jidosha Kabushiki Kaisha Support structure of exhaust system heat exchanger
WO2015058946A1 (en) * 2013-10-23 2015-04-30 Güntner Gmbh & Co. Kg Housing device for a heat exchanger

Also Published As

Publication number Publication date
GB9823669D0 (en) 1998-12-23
US6811756B2 (en) 2004-11-02
US20020025282A1 (en) 2002-02-28
AU1054000A (en) 2000-05-22
JP2002529636A (en) 2002-09-10
EP1127215A1 (en) 2001-08-29

Similar Documents

Publication Publication Date Title
US6811756B2 (en) Exhaust gas cooler
US7246437B2 (en) Heat exchanger for cooling exhaust gas and method of manufacturing same
US4848449A (en) Heat exchanger, especially for cooling cracked gas
US4386652A (en) Heat exchange assembly
US8602089B2 (en) Heat exchanger apparatus for accommodating thermal and/or pressure transients
EP1250559B1 (en) Exhaust gas heat exchanger
JP3129727B2 (en) Tube bundle heat exchanger
JP2011506896A (en) Recirculation exhaust gas cooler for internal combustion engines
JP4180359B2 (en) Heat exchanger
US20070017661A1 (en) Heat exchanger
US4483392A (en) Air to air heat exchanger
US4204573A (en) Heat exchanger with concentric flow tubes
EP1048915B1 (en) Heat exchanger
JP3991786B2 (en) Exhaust heat exchanger
US5265673A (en) Compact manifold for a heat exchanger with multiple identical heating tubes
CA2899275A1 (en) Heat exchanger having a compact design
US4815533A (en) Heat exchanger
US4157114A (en) Tubesheet with a thermal sleeve
CN110542334A (en) Pure countercurrent shell and tube type fresh water cooler
EP2463490B1 (en) Improvements in or relating to gas coolers for internal combustion engines
JPH01134198A (en) Tube-fin type heat exchanger assembly
KR20040091867A (en) A heat exchanger of shell - tube type having silicon carbide tube
JP2001304049A (en) Multiple pipe type egr gas cooling device
JPH0449494Y2 (en)
CN219015055U (en) Shell-and-tube heat exchanger

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref country code: AU

Ref document number: 2000 10540

Kind code of ref document: A

Format of ref document f/p: F

AK Designated states

Kind code of ref document: A1

Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK DM EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

WWE Wipo information: entry into national phase

Ref document number: 1999954096

Country of ref document: EP

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
ENP Entry into the national phase

Ref country code: JP

Ref document number: 2000 579873

Kind code of ref document: A

Format of ref document f/p: F

WWE Wipo information: entry into national phase

Ref document number: 09846030

Country of ref document: US

WWP Wipo information: published in national office

Ref document number: 1999954096

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWW Wipo information: withdrawn in national office

Ref document number: 1999954096

Country of ref document: EP